Shiva Purana
तस्माद्वै शिवभक्तस्य माहात्म्यं वेत्ति को नरः । शिवशक्त्योः पूजनं च शिवभक्तस्य पूजनम् 1-17-१५० ।
Who indeed knows the greatness of the devotee of Shiva, who worships Shiva and His power? Worship of Shiva and His energy is indeed the worship of the devotee of Shiva.
english translation
tasmAdvai zivabhaktasya mAhAtmyaM vetti ko naraH । zivazaktyoH pUjanaM ca zivabhaktasya pUjanam 1-17-150 ।
hk transliteration by Sanscript